| 21. | Three days of rain last week forced volcanic debris from Mount Pinatubo to cascade down its slopes.
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| 22. | Superheated volcanic debris still remain on the slopes around Mount Pinatubo after it erupted in June 1991.
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| 23. | U . S . troops abandoned the air field in 1991 when nearby Mount Pinatubo began erupting.
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| 24. | For example, the Cabalantian tragedy occurred four years subsequent to the 1991 eruption of Mount Pinatubo.
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| 25. | The second is Parua river which originates from Sacobia-Bamban river that comes from Mount Pinatubo.
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| 26. | In June 1991, Mount Pinatubo in Central Luzon erupted, after being dormant for 600 years.
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| 27. | Clark was abandoned in 1991 after it was buried in volcanic ash by the eruption of Mount Pinatubo.
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| 28. | That same year, the eruption of the Mount Pinatubo volcano forced the Air Force to abandon Clark.
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| 29. | Provinces surrounding volcanic Mount Pinatubo, which erupted in 1991, would also be spared, they said.
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| 30. | After striking Manila, the storm was expected to threaten several northern provinces surrounding the Mount Pinatubo volcano.
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